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Nikolaos Nikolaou


Last seen: 3 days ago Active since 2015

Physics , Wholesale auctions , Crypto Mining , Renewable Energy

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  • Sequences And Series II Master
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  • Matrix Manipulation II Master
  • Indexing IV Master
  • Number Manipulation II Master
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List the semiprimes
A semiprime number—or a 2-almost prime—is the product of two prime numbers. The numbers and are semiprimes, but and are not....

4 days ago

Solved


Sequence
Let S be a sequence of numbers Let Find for some , where and .

8 days ago

Solved


Find Min and Max Differences in a Vector
Given an array of integers, return the absolute largest and smallest (non zero) difference between any two numbers in the array....

8 days ago

Solved


Determine if all elements are odd
Given an array, return true if all of the elements are odd. ex. x = [3 4 1] allOdd(x) ans = false ex. x = [3 5 7; 5 9...

8 days ago

Solved


Find the number of primes leq than input
Given an integer n, determine the number of primes less than or equal to n.

8 days ago

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Sum of 2 numbers in array
Given an array and a target sum, return true if any 2 numbers in the array sum up to the given target sum. Both numbers cannot h...

8 days ago

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Momentum Calculation
A shopping cart of mass 'm1' is traveling with velocity 'u' and collides with a second shopping cart of mass 'm2.' The two shopp...

8 days ago

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Determine whether one vector is a subset of another
While bumbling through a pair of problems in the Number Theory group, I wrote code to determine whether a vector is a subset of ...

18 days ago

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Sort vector by number of prime factors of each element
Sort a given array based on how many prime factors each term has. Sort from least to greatest and output original values. Ex: ...

29 days ago

Solved


Return longest string in 1-D array of strings
Find the longest string in an array of strings. Return an empty string if the initial array is empty. If there are multiple stri...

29 days ago

Solved


Extract the main diagonal of a matrix
Extract the main diagonal of a matrix and return as an array. For example, the main diagonal of the following matrix would be: ...

29 days ago

Solved


Draw a fancy '7' in a zero matrix!
Given a x-by-x matrix filled with zeros (x is odd and > 3). Use 7s to draw a number 7 into it! Like this: x = 5, y = 7 7 7 7 7...

29 days ago

Solved


Caesar Cipher Shift
Given a word and its encrypted version using the caesar cipher, find the shift used.

29 days ago

Solved


Mix it up!
Given an input string S, return a new string B, that is created by taking one character from the front and then the end iterativ...

29 days ago

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Monty Python and the Holy Grail: Crossing the Bridge of Death
To cross the Bridge of Death, your function must return the numerical value for the airspeed velocity of an unladen swallow

29 days ago

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Absolute Value of the Product of Complex Numbers
Find the absolute value (modulus) of the product of two complex numbers given by a + bi and c + di.

30 days ago

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True engineer
Prove that pi is indeed equal to e. Return 1 by rounding pi and e to the nearest integer then asserting rounded pi and e are eq...

30 days ago

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Determine if a number is divisible by two
Determine whether the number is divisible by two

30 days ago

Solved


Find two numbers that add up to the target value
Given a vector A and target n, return the indices of two numbers that add up to n. If there are multiple solutions, return the f...

30 days ago

Solved


Determine if the number is divisible by 5 or not
Given a number, return true if it is divisble by 5

30 days ago

Solved


Draw a X
Given an input , create a square matrix of zeros with an X of ones. Ex. n = 3 drawX(3) [ 1 0 1 0 1 0 1 0 1 ] ...

30 days ago

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Caesar Cipher
Given a input word x and a shift n, encrypt the word with caesar cipher of shift n.

30 days ago

Solved


Determine whether a number is unprimeable
The number 204 is unprimeable because no single digit can be changed to make it prime. In contrast, the number 207 is not unprim...

1 month ago

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Find the smallest prime with n inside
Consider the sequence that begins 101, 113, 127, 131, 149, 151, 163,... Not only is every term prime, the th term is the smalles...

1 month ago

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Mean ignoring NaNs
Define a function that behaves in the same way as mean(x) and mean(x,d) except that it ignores NaNs (unless all of the values be...

2 months ago

Solved


Cat's paw - 01
lets imagine a cat, standing on an infinitely long row of tiles. since its a 'cat', string length=3; it takes 3 tiles to stand. ...

2 months ago

Solved


A sequence of Ones
You are given number(s) with all digits - 1. Your answer will depend on the count of 1 in the given number, for example - x1...

2 months ago

Solved


Leyland Primes
A Leyland Number is defined as a number of the form - x^y + y^x, or, x^y - y^x (x,y)>1 Given an array of numbers(>1), check...

2 months ago

Solved


Animated GIF Creator
This Challenge is to execute the Function Template which has a fully functional Animated GIF creator of a shape related to a Zer...

2 months ago

Solved


Binpack Contest: Retro
The <http://www.mathworks.com/matlabcentral/contest/contests/3/rules Full Binpack Rules and examples>. This Challenge is a re...

2 months ago

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